1. Kelly Clarkson
The first singer to win American Idol, Kelly Clarkson built her legacy as an outstanding singer and even better role model. Over a decade has passed since the Texas-born rock-pop singer was crowned an idol, but her fame keeps growing. She is the only contestant from the casting show to win 2 Grammy’s, but what’s most impressive is her fan base: 91 number one singles in the U.S (across numerous charts), 11 international number one singles and over 20 million albums sold worldwide. Considering all of this happened in 10 years, I applaud this petite lady with the big voice and crown her the most successful casting show winner.
